Centrifugal pump impeller and centrifugal pump

Abstract

The invention discloses a centrifugal pump impeller and a centrifugal pump, and relates to the technical field of rotary fluid machinery. The centrifugal pump impeller comprises an impeller body and a baffle which are sequentially arranged in the axial direction and fixedly connected, one end of the impeller body in the axial direction is an impeller inlet, and the side face is provided with an impeller outlet communicated with the impeller inlet. The baffle is of an annular structure arranged on the outer side of the impeller inlet in a sleeving mode, the baffle and the impeller body form an annular impeller groove, and an opening of the impeller groove faces the outer side in the radial direction. According to the centrifugal pump impeller, the baffles are additionally arranged, equivalently, reinforcing ribs are additionally arranged, the strength and abrasion resistance of the impeller can be improved, the problems of deformation and abrasion caused by high-speed rotation of the impeller are effectively prevented, and the problem of deformation at an inlet of the impeller is solved; the reverse flow controllable technology is introduced, due to the existence of the impeller groove formed between the baffle and the impeller body, fluid can be blocked, the overflow problem is solved, overflow and hydraulic loss from a high-pressure area to a low-pressure area are reduced, and the energy efficiency of the pump is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary fluid machinery, and in particular to a centrifugal pump impeller and a centrifugal pump. Background Art

[0002] A centrifugal pump is a pump that uses the centrifugal force generated by the rotation of an impeller to transport liquid. The pump body has an impeller. If the impeller runs continuously for a long time, the impeller inlet on the first cover plate near the liquid inlet of the pump casing may be easily deformed or broken. In addition, there is a problem of fluid overflow due to pressure difference on the suction side of the first cover plate, causing the fluid to flow back from the high-pressure area (impeller outlet) along the contour of the first cover plate to the low-pressure area on the side of the impeller (impeller inlet), forming overflow, increasing hydraulic loss, affecting the performance of the pump, and increasing power consumption.

[0003] Therefore, how to improve the impeller deformation and wear problems, as well as the overflow problem, are technical problems that technical personnel in this field currently need to solve. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a centrifugal pump impeller and a centrifugal pump including the centrifugal pump impeller, which can improve the deformation and wear problems of the impeller and the overflow problem.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A centrifugal pump impeller comprises an impeller body and a baffle which are arranged in sequence along the axial direction and fixedly connected, wherein one end of the impeller body in the axial direction is an impeller inlet, and the side surface has an impeller outlet connected to the impeller inlet; the baffle is an annular structure sleeved on the outside of the impeller inlet, the baffle and the impeller body form an annular impeller groove, and the opening of the impeller groove faces radially outward.

[0007] Preferably, the cross-section of the impeller groove is rectangular, W-shaped, C-shaped, S-shaped or V-shaped.

[0008] Preferably, the baffle comprises an annular end plate extending in the radial direction and an annular side plate extending in the axial direction, and two axial ends of the side plate are respectively fixed to the radial inner end of the end plate and the impeller body.

[0009] Preferably, the baffle comprises an annular end plate, one end of the end plate is fixed to the impeller body and the other end is a free end, and the axial end surface of the end plate close to the impeller body comprises a first inclined surface, which is deflected radially outward in a direction away from the impeller body.

[0010] Preferably, a region on the axial end surface of the impeller body close to the baffle that interfaces with the impeller inlet is a second inclined surface, and the second inclined surface is inclined radially outward in a direction away from the baffle.

[0011] Preferably, the impeller body comprises a first cover plate, blades and a second cover plate which are sequentially arranged and fixedly connected along the axial direction; the impeller inlet is arranged on the first cover plate, and the impeller outlet is located between adjacent blades; the baffle is fixed on the edge of the impeller inlet.

[0012] Preferably, the distance between the radial outer end of the first cover plate and the rotation center line of the impeller body is greater than the distance between the radial outer end of the baffle plate and the rotation center line.

[0013] Preferably, an inlet guide platform protruding toward the impeller inlet is further provided at a middle portion of the axial end surface of the second cover plate close to the first cover plate.

[0014] A centrifugal pump comprises a pump casing and also comprises a centrifugal pump impeller as described above, wherein the centrifugal pump impeller is arranged in the pump casing; a liquid inlet is arranged in the middle of one axial end of the pump casing, and a liquid outlet is arranged on the side; the impeller inlet is opposite to the liquid inlet, and the impeller outlet is opposite to the liquid outlet.

[0015] Preferably, a guide ring is fixedly arranged in the pump housing, and one axial end of the guide ring is fixed to the liquid inlet; and the baffle is sleeved on the outside of the guide ring.

[0016] The centrifugal pump impeller provided by the present invention comprises an impeller body and a baffle which are arranged in sequence along the axial direction and fixedly connected, wherein one end of the impeller body in the axial direction is an impeller inlet, and the side surface has an impeller outlet connected to the impeller inlet; the baffle is an annular structure sleeved on the outside of the impeller inlet, the baffle and the impeller body form an annular impeller groove, and the opening of the impeller groove faces radially outward.

[0017] In the centrifugal pump impeller, by adding a baffle, it is equivalent to adding reinforcing ribs, which can improve the strength and wear resistance of the impeller, effectively prevent the deformation and wear of the impeller caused by high-speed rotation, improve the deformation problem at the impeller inlet, and reduce the occurrence of shrinkage holes; the reverse flow controllable technology is introduced, for the fluid that flows back from the impeller outlet along the outer surface of the impeller body toward the impeller inlet or the liquid inlet, due to the existence of the impeller groove formed between the baffle and the impeller body, the fluid can be blocked, the overflow problem is improved, thereby optimizing the liquid flow, reducing the overflow and hydraulic loss from the high-pressure area to the low-pressure area, and improving the energy efficiency of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 This is a structural schematic diagram of a specific embodiment 1 of a centrifugal pump provided by the present invention;

[0020] Figure 2 A cross-sectional view of a specific embodiment 1 of a centrifugal pump provided by the present invention;

[0021] Figure 3 A cross-sectional view of the impeller groove of the centrifugal pump impeller of the first specific embodiment provided by the present invention;

[0022] Figure 4 A cross-sectional view of the impeller groove of the second specific embodiment of the centrifugal pump impeller provided by the present invention;

[0023] Figure 5 A cross-sectional view of the impeller groove of the centrifugal pump impeller of the third specific embodiment provided by the present invention;

[0024] Figure 6 A cross-sectional view of the impeller groove of a specific embodiment 4 of the centrifugal pump impeller provided by the present invention;

[0025] Figure 7 This is a cross-sectional view of the impeller groove of the fifth specific embodiment of the centrifugal pump impeller provided by the present invention.

[0026] Reference numerals:

[0027] Pump housing 1, liquid inlet 11, liquid outlet 12, guide ring 13, pump chamber 14;

[0028] Baffle 2, impeller groove 21, side plate 22, end plate 23, first inclined surface 24;

[0029] The impeller body 3 , the first cover plate 31 , the impeller inlet 311 , the second inclined surface 312 , the second cover plate 32 , the inlet guide platform 321 , the blades 33 , the impeller outlet 331 , the stud groove 34 , and the impeller mounting seat 35 . DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The core of the present invention is to provide a centrifugal pump impeller and a centrifugal pump including the centrifugal pump impeller, which can improve the impeller deformation and wear problems, as well as the overflow problem.

[0032] The centrifugal pump impeller provided by the present invention is applied to a centrifugal pump, and belongs to the field of rotating fluid machinery such as pumps, fans, compressors, etc. Figure 1 and Figure 2 As shown, the centrifugal pump comprises a pump head, which comprises a pump housing 1 and a centrifugal pump impeller arranged in a pump chamber 14 of the pump housing 1 .

[0033] A liquid inlet 11 is arranged at the middle of one end of the pump housing 1 in the axial direction, and a liquid outlet 12 is arranged at the side of the pump housing 1 .

[0034] The centrifugal pump impeller includes an impeller body 3, one end of the impeller body 3 in the axial direction is an impeller inlet 311, and the side of the impeller body 3 has an impeller outlet 331 connected to the impeller inlet 311. After being installed in the pump housing 1, the impeller inlet 311 is arranged opposite to the liquid inlet 11, and the impeller outlet 331 is arranged opposite to the liquid outlet 12.

[0035] Specifically, the impeller body 3 includes a first cover plate 31, blades 33 and a second cover plate 32 which are sequentially arranged and fixedly connected along the axial direction. Specifically, a plurality of blades 33 are distributed in the circumferential direction of the impeller body 3. The impeller inlet 311 is provided on the first cover plate 31, and the impeller outlet 331 is located between adjacent blades 33.

[0036] When the centrifugal pump is running, the centrifugal pump impeller rotates under the drive of the motor, and the centrifugal force can be used to drive the liquid to circulate. The liquid can enter the pump housing 1 through the liquid inlet 11, enter the impeller body 3 through the impeller inlet 311, flow out of the impeller body 3 through the impeller outlet 331, and then flow out of the pump housing 1 through the liquid outlet 12. The liquid transported by the pump is not limited to water, but can also be other liquids.

[0037] like Figure 2 As shown, the centrifugal pump impeller further includes a baffle 2 fixed to one end of the impeller body 3 in the axial direction, specifically, the baffle 2 is fixed to the axial end surface of the first cover plate 31 away from the second cover plate 32. The baffle 2 is an annular structure sleeved on the outside of the impeller inlet 311, and accordingly, the baffle 2 and the impeller body 3 form an annular impeller groove 21, and the opening of the impeller groove 21 faces radially outward.

[0038] In the centrifugal pump impeller, by adding a baffle 2, it is equivalent to adding reinforcing ribs, which can improve the strength and wear resistance of the impeller, effectively prevent the deformation and wear of the impeller caused by high-speed rotation, improve the deformation problem at the impeller inlet 311, and reduce the occurrence of shrinkage holes; the reverse flow controllable technology is introduced, for the fluid that flows back from the impeller outlet 331 along the outer surface of the impeller body 3 toward the impeller inlet 311 or the liquid inlet 11, due to the existence of the impeller groove 21 formed between the baffle 2 and the impeller body 3, the fluid can be blocked, the overflow problem is improved, thereby optimizing the liquid flow, reducing the overflow and hydraulic loss from the high-pressure area to the low-pressure area, and improving the pump energy efficiency.

[0039] Regarding the arrangement of the baffle 2 and the impeller groove 21, as Figure 3 As shown, the baffle 2 includes an annular end plate 23 extending radially and an annular side plate 22 extending axially, and two axial ends of the side plate 22 are respectively fixed to the radial inner end of the end plate 23 and the impeller body 3.

[0040] Specifically, Figure 3 As shown, the side plate 22 is a cylindrical structure, and the end plate 23 is a circular flat plate, and the two constitute the baffle 2. The baffle 2 and the part of the impeller body 3 close to the impeller inlet 311 form an I-shaped structure, and form an impeller groove 21 with a rectangular cross-section. The structure is simple and easy to process.

[0041] Alternatively, the axial end surface of the end plate 23 close to the impeller body includes a first inclined surface 24, and the first inclined surface 24 is inclined radially outward in a direction away from the impeller body 3, which can be specifically as follows: Figure 4 As shown, it is inclined in a broken line manner, or, as Figure 5 The arc-shaped inclination shown can reduce the possibility of the backflowing fluid being retained in the impeller groove 21 .

[0042] Alternatively, the end plate 23 may not be connected to the impeller body 3 through the side plate 22, but may be directly fixed to the impeller body 3. Figure 6 In the illustrated embodiment, the first inclined surface 24 directly forms an angle with the first cover plate 31 to serve as the impeller groove 21 , thereby simplifying the structure of the baffle 2 .

[0043] In addition, if Figures 4 to 6 As shown, the axial end surface of the end plate 23 close to the impeller body can be used as the first inclined surface 24. Alternatively, referring to Figure 7 A partial surface of the end plate 23 on the axial end surface close to the impeller body can serve as the first inclined surface 24 .

[0044] Among them, Figures 4 to 6As shown, the area on the axial end surface of the impeller body 3 close to the baffle 2 (i.e., the axial end surface on the first cover plate 31 away from the second cover plate 32) that docks with the impeller inlet 311 is the second inclined surface 312, and the second inclined surface 312 is deflected radially outward in the direction away from the baffle 2, which can reduce the possibility of the backflow fluid being retained in the impeller groove 21. When the impeller body 3 has the second inclined surface 312 and the baffle 2 is provided with the first inclined surface 24 at the same time, it can further ensure that the impeller groove 21 opens gradually from its radial inner end toward the radial outer shell, which can further avoid the retention of fluid, and accordingly, the cross section of the impeller groove 21 is W-shaped, C-shaped, S-shaped or V-shaped.

[0045] Furthermore, the cross section of the impeller groove 21 may be a symmetrical figure that is symmetrical with respect to a plane perpendicular to the axial direction, so that the structure of the impeller groove 21 is relatively regular.

[0046] For the assembly between the baffle plate 2 and the first cover plate 31, as shown in FIG. Figure 1 and Figure 2 As shown, the baffle 2 is fixed on the edge of the impeller inlet 311. Since the baffle 2 is fixed on the edge of the impeller inlet 311, the circumference of the baffle 2 can be minimized, which is beneficial to weight reduction. In addition, the distance between the radial outer end of the first cover plate 31 and the rotation centerline of the impeller body 3 is greater than the distance between the radial outer end of the baffle 2 and the rotation centerline, then in the radial direction, the size of the baffle 2 is also smaller, which can further reduce weight.

[0047] Furthermore, if Figure 2 As shown, the middle part of the axial end surface of the second cover plate 32 close to the first cover plate 31 is also provided with an inlet guide platform 321 protruding toward the impeller inlet 311 to guide the liquid after entering the impeller inlet 311. Of course, in other embodiments, the inlet guide platform 321 can also be replaced by a plane perpendicular to the axial direction.

[0048] In addition, a stud groove 34 and an impeller mounting seat 35 may be provided on the second cover plate 32. The stud groove 34 facilitates the installation and fixation of the pump shaft. A shaft sleeve is provided in the impeller mounting seat 35. The pump shaft and the impeller body 3 may be connected through a keyway provided in the shaft sleeve, thereby improving the operational stability of the pump. In addition, a threaded blind hole may also be provided on the end face of the pump shaft, which may facilitate the fixation of the pump shaft and the impeller body 3 and ensure the normal operation of the pump.

[0049] In addition to the above-mentioned centrifugal pump impeller, the present invention also provides a centrifugal pump including the above-mentioned centrifugal pump impeller, which can effectively improve the liquid flow rate and pressure, so that the performance of the pump can reach the best effect, and the beneficial effects can also refer to the above embodiments accordingly. In addition, a guide ring 13 is fixedly arranged in the pump housing 1, and one axial end of the guide ring 13 is fixed to the liquid inlet 11, which can guide the fluid entering the liquid inlet 11. The baffle 2 is sleeved on the outside of the guide ring 13, wherein there is a gap between the baffle 2 and the guide ring 13 and between the baffle 2 and the pump housing 1, so as to facilitate the smooth rotation of the impeller body 3.

[0050] The centrifugal pump impeller and the centrifugal pump provided by the present invention have the ability to suppress recirculation, which can improve the efficiency, performance and operating stability of the pump, and provide the industry with a high-quality and high-efficiency impeller.

[0051] It should be noted that when an element is referred to as "fixed" to another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element in the middle. In addition, in the description of the present invention, unless otherwise specified, "multiple", "multiple roots", "multiple groups" mean two or more.

[0052] The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0054] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0055] The centrifugal pump impeller and the centrifugal pump provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A centrifugal pump impeller, characterized in that: The invention comprises an impeller body (3) and a baffle (2) which are sequentially arranged in the axial direction and fixedly connected, wherein one end of the impeller body (3) in the axial direction is an impeller inlet (311), and the side surface is provided with an impeller outlet (331) which is connected to the impeller inlet (311); the baffle (2) is an annular structure which is sleeved on the outside of the impeller inlet (311), and the baffle (2) and the impeller body (3) form an annular impeller groove (21), and the opening of the impeller groove (21) faces radially outward.

2. The centrifugal pump impeller according to claim 1, characterized in that: The cross section of the impeller groove (21) is rectangular, W-shaped, C-shaped, S-shaped or V-shaped.

3. The centrifugal pump impeller according to claim 1, characterized in that: The baffle (2) comprises an annular end plate (23) extending radially and an annular side plate (22) extending axially, and two axial ends of the side plate (22) are respectively fixed to the radial inner end of the end plate (23) and the impeller body (3).

4. The centrifugal pump impeller according to claim 1, characterized in that: The baffle (2) comprises an annular end plate (23), one end of the end plate (23) is fixed to the impeller body (3) and the other end is a free end, and the axial end surface of the end plate (23) close to the impeller body (3) comprises a first inclined surface (24), and the first inclined surface (24) is inclined radially outward in a direction away from the impeller body (3).

5. The centrifugal pump impeller according to claim 1, characterized in that: An area on the axial end surface of the impeller body (3) close to the baffle (2) that butts against the impeller inlet (311) is a second inclined surface (312), and the second inclined surface (312) is inclined radially outward in a direction away from the baffle (2).

6. The centrifugal pump impeller according to any one of claims 1 to 5, characterized in that: The impeller body (3) comprises a first cover plate (31), blades (33) and a second cover plate (32) which are sequentially arranged and fixedly connected along the axial direction; the impeller inlet (311) is arranged on the first cover plate (31), and the impeller outlet (331) is located between adjacent blades (33); and the baffle (2) is fixed on the edge of the impeller inlet (311).

7. The centrifugal pump impeller according to claim 6, characterized in that: The distance between the radial outer end of the first cover plate (31) and the rotation center line of the impeller body (3) is greater than the distance between the radial outer end of the baffle plate (2) and the rotation center line.

8. The centrifugal pump impeller according to claim 6, characterized in that: The middle portion of the axial end surface of the second cover plate (32) close to the first cover plate (31) is also provided with an inlet guide platform (321) protruding toward the impeller inlet (311).

9. A centrifugal pump, comprising a pump casing (1), characterized in that: It also includes the centrifugal pump impeller according to any one of claims 1 to 8, wherein the centrifugal pump impeller is arranged in the pump casing (1); a liquid inlet (11) is arranged in the middle of one axial end of the pump casing (1), and a liquid outlet (12) is arranged on the side; the impeller inlet (311) is opposite to the liquid inlet (11), and the impeller outlet (331) is opposite to the liquid outlet (12).

10. The centrifugal pump according to claim 9, characterized in that A guide ring (13) is fixedly arranged inside the pump housing (1), and one axial end of the guide ring (13) is fixed to the liquid inlet (11); the baffle (2) is sleeved on the outside of the guide ring (13).

Images